Negative plate for storage batteries.



WILLIAM MOREISQU' NEGATEVE FLA '1 No Drawing.

Pasted plates. as thus usually made. have however the disadvantage thatthe nu-tialiie spongy lead formed by reduction oi to tire material is not always in good t'lzu't contact wlth the supporting grid. each on n of contact increasnug the resistance o: tee

battery.

The ob ect. ot this invent ion this disadvantage. and i attain the: ob ec;

by first subjecting the grids to a sand bla. wherebv the surfaces oi the t l a roughened The plates are two 7 Jill' mav be tormed in the usual a t'ur ic acid electrolyte, the lt lead being reduced in intimate the roughened surface of the comluct-ivitv is thereby rn-oduced bee-a m the intimate contact between. the rune! 'ncil grid and the reduced spopg lead instead of using a sulturic acnt (t iivte in the forming proce i oreti-r i reduce the lead o"icl of the lilltK magnesium sulfate solutiini. as the reduction of the ()Xiti w 'ing the oXids to first becoine sui the case when sulfuric acid is used.

Specification of Letters Patent.

CHICAGO.

OF ILLINOIS.

51 EUR STORAGE BATTERIES.

Patented Nov. 12. 1918.

Application file 'i'iebruary 19.1918. Serial No.'218.126.

preferred method a more even reduction of the lead oXid all over the surface of the plate is obtained. whereby an undue liberation of hydrogen between the grid and the, active material is avoided so that the intimate contact between the reduced lead and the pitted support is maintained.

I thus obtain a plate in which a more. complete bond is effected between the active material and the plate and because 01 the greater surfaces in contact and the more thorough adhesion of active material to the plate. greatei conductivity results.

I claim:

l. The method of manufacturing negative storagebattery plates which consists in saml blast.i.n5 the grid. filling: the grid with lead oxid. and then electrolytically re- (iitt'iltg said oxid to spongy lead. whereby the reduced lead is maintained in intimate comluctire contact with the roughened grid.

The method of manufacturing negative storage batter plaes which consists in sand-blasting the grid. filling the erid with lead oxid. and then electrolvticallv reduciiu: said oxid to spongy lead in a solution ot' iil;t,.itl1:ittl!l sulfate. .vhercby the reduced lu'aql is maintained in intimate contact with the roughened grid.

l. It neggz-itive plate for storage batteries consisting of a sand-blasted grid having spongy lead in intimate electrical conductive contact with the roughened surface of aid t. ,i. negative plate for storage batteries tt claina-zl in claim 3 produced by the process claimed in claim 2.

In testimony whereof I atiiX my signature.

WILLIAM MORRISON. 

